Warn trivial recursion with module prefix#23278
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tgodzik merged 1 commit intoscala:mainfrom Jun 3, 2025
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As pointed out on the ticket, Also pondering |
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tgodzik
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Fixes scala#23277 First, loosen the test for whether to warn for `module.recur()`. The `this` assignment has a RHS that is not pure (because of module init) but `isStable` (and not significant with respect to the warning). Second, avoid emitting such a `this` assignment if the prefix is the enclosing module. The existing code checks for a prefix that is `Enclosing.this`. Other "aliasing" prefixes are not considered, such as a method with result `this.type`, since they could execute arbitrary intended effects. [Cherry-picked 451cc74]
tgodzik
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Jun 20, 2025
Fixes scala#23277 First, loosen the test for whether to warn for `module.recur()`. The `this` assignment has a RHS that is not pure (because of module init) but `isStable` (and not significant with respect to the warning). Second, avoid emitting such a `this` assignment if the prefix is the enclosing module. The existing code checks for a prefix that is `Enclosing.this`. Other "aliasing" prefixes are not considered, such as a method with result `this.type`, since they could execute arbitrary intended effects. [Cherry-picked 451cc74]
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Fixes #23277
First, loosen the test for whether to warn for
module.recur(). Thethisassignment has a RHS that is not pure (because of module init) butisStable(and not significant with respect to the warning).Second, avoid emitting such a
thisassignment if the prefix is the enclosing module. The existing code checks for a prefix that isEnclosing.this.Other "aliasing" prefixes are not considered, such as a method with result
this.type, since they could execute arbitrary intended effects.